src: Move GetDOMException() into Environment

GetDOMException() was a private function in node_messaging, but we would
like to use it to throw AbortErrors when cancelling something via an
AbortController. Move it into environment.cc along with
GetPerContextExports(), and expose it internally in node_internals.h.

Author: ptomato

src/api/environment.cc

@@ -525,6 +525,21 @@ MaybeLocal<Object> GetPerContextExports(Local<Context> context) {
   return handle_scope.Escape(exports);
 }
 
+MaybeLocal<Function> GetDOMException(Local<Context> context) {
+  Isolate* isolate = context->GetIsolate();
+  Local<Object> per_context_bindings;
+  Local<Value> domexception_ctor_val;
+  if (!GetPerContextExports(context).ToLocal(&per_context_bindings) ||
+      !per_context_bindings
+           ->Get(context, FIXED_ONE_BYTE_STRING(isolate, "DOMException"))
+           .ToLocal(&domexception_ctor_val)) {
+    return MaybeLocal<Function>();
+  }
+  CHECK(domexception_ctor_val->IsFunction());
+  Local<Function> domexception_ctor = domexception_ctor_val.As<Function>();
+  return domexception_ctor;
+}
+
 // Any initialization logic should be performed in
 // InitializeContext, because embedders don't necessarily
 // call NewContext and so they will experience breakages.

src/node_internals.h

@@ -301,6 +301,7 @@ v8::Isolate* NewIsolate(v8::Isolate::CreateParams* params,
 v8::MaybeLocal<v8::Value> StartExecution(Environment* env,
                                          StartExecutionCallback cb = nullptr);
 v8::MaybeLocal<v8::Object> GetPerContextExports(v8::Local<v8::Context> context);
+v8::MaybeLocal<v8::Function> GetDOMException(v8::Local<v8::Context> context);
 v8::MaybeLocal<v8::Value> ExecuteBootstrapper(
     Environment* env,
     const char* id,

src/node_messaging.cc

@@ -224,21 +224,6 @@ MaybeLocal<Function> GetEmitMessageFunction(Local<Context> context) {
   return emit_message_val.As<Function>();
 }
 
-MaybeLocal<Function> GetDOMException(Local<Context> context) {
-  Isolate* isolate = context->GetIsolate();
-  Local<Object> per_context_bindings;
-  Local<Value> domexception_ctor_val;
-  if (!GetPerContextExports(context).ToLocal(&per_context_bindings) ||
-      !per_context_bindings->Get(context,
-                                FIXED_ONE_BYTE_STRING(isolate, "DOMException"))
-          .ToLocal(&domexception_ctor_val)) {
-    return MaybeLocal<Function>();
-  }
-  CHECK(domexception_ctor_val->IsFunction());
-  Local<Function> domexception_ctor = domexception_ctor_val.As<Function>();
-  return domexception_ctor;
-}
-
 void ThrowDataCloneException(Local<Context> context, Local<String> message) {
   Isolate* isolate = context->GetIsolate();
   Local<Value> argv[] = {message,